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Technical Details

Trojan:SymbOS/ZeusMitmo.A is notable for being specifically designed to steal SMS messages containingm obile transaction authentication number (mTANs), which are like single-use passwords sent by banks to to their account holders' mobile phones to verify online transactions.

Distribution

Trojan-Spy:W32/Zbot.PUA sends an SMS message to the user's phone containing a link to a website hosting the malicious ZeusMitmo trojan. If the link is followed, the trojan is promptly downloaded and installed on the phone.

In our analysis, the malicious trojan was a Symbian-signed file for S60 3rd Edition and 5th Edition mobile phones. The file itself is named cert.sis, and may be deceptively billed as a 'Nokia Update'. .jad files, used for Blackberry devices, have also been reported.

Installation

During installation, the trojan registers itself to start when the phone is booted up. Once active, the trojan is able to silently monitor all incoming SMS messages.

Activity

If an SMS is sent to the user's mobile device with the target bank's authentication code, the malicious software running in the device forwards the SMS to another terminal controlled by the attacker.

The trojan contains a hard-coded phone number for use in sending the stolen SMS messages and receiving commands from the attacker(s).